Spain is famous for its weather, Benidorm, Spanish food, it's football team, Barcelona, and basically being a rather sunny place overall â none of these descriptions are incorrect, and in fact they are all entirely true!
As the temperature of the air increases its density decreases. Therefore the thrust produced by the engine decreases. As the air pressure increases, its density increases, causing thrust produced by the engine to increase. Altitude has a double effect on thrust. As the altitude increases, the air becomes colder and denser, up to the beginning of stratosphere. This causes the thrust to increase.
Convection currents 2. As the magma heats, it rises to the upper mantle. As the magma reaches the upper Mantle, it reduces in temperature and begins to become more rigid. Due to this increased weight the magma begins to fall to the lower Mantle.